isinglass

any of various minerals consisting of hydrous silicates of aluminum or potassium etc. that crystallize in forms that allow perfect cleavage into very thin leaves; used as dielectrics because of their resistance to electricity

सफ़ेदी लिए हुए अर्द्ध पारदर्शी पदार्थ जो ताज़े पानी में पाई जानेवाली कुछ मछलियों से प्राप्‍त होता है|

Examples are fat, flesh, blood, milk, eggs, and lesser known products, such as isinglass and rennet.